How To Fix B1220 - Reference to message type & has already been defined

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 220

• Message text: Reference to message type & has already been defined

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message B1220 - Reference to message type & has already been defined ?

  The SAP error message B1220, which states "Reference to message type & has already been defined," typically occurs in the context of message type configuration in the SAP system, particularly when dealing with IDocs (Intermediate Documents) or other messaging frameworks.
  Cause:
  This error arises when there is an attempt to define a message type that has already been defined in the system. This can happen due to:
  
  Duplicate Entries: The message type you are trying to create or modify already exists in the system.
  Configuration Errors: There may be inconsistencies in the configuration settings or an attempt to redefine a message type that is already in use.
  Transport Issues: If you are transporting configurations from one system to another, there may be conflicts if the message type already exists in the target system.
  
  Solution:
  To resolve the B1220 error, you can take the following steps:
  
  
  Check Existing Message Types:
  
  Go to transaction code WE30 (for IDoc types) or WE81 (for message types) and check if the message type you are trying to define already exists.
  If it does exist, you may need to modify the existing definition instead of creating a new one.
  
  
  
  Modify or Delete Duplicate:
  
  If you find a duplicate message type that is not needed, you can delete it or modify it as necessary.
  Ensure that any changes made do not affect other processes that rely on the existing message type.
  
  
  
  Review Transport Requests:
  
  If the error occurred after a transport, check the transport requests to ensure that they do not contain conflicting definitions.
  You may need to adjust the transport or resolve conflicts before proceeding.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to message types and IDocs for any specific guidelines or best practices.
  
  
  
  Check for Custom Developments:
  
  If there are custom developments or enhancements in your system, ensure that they are not inadvertently causing conflicts with standard message types.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  WE30: IDoc Type Development
  WE81: Message Type Development
  WE82: Message Type Assignment
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to message types and IDocs.
  IDoc Monitoring: Use transaction WE02 or WE05 to monitor IDocs and see if there are any related issues.
  
  By following these steps, you should be able to identify the cause of the B1220 error and implement a solution to resolve it. If the issue persists, consider reaching out to your SAP Basis or technical team for further assistance.